Nuclear chemistry

Sodium

Boron

Metallurgy

Materials science

Chromatography

Calcium

Nuclear physics

Biochemistry

Radiochemistry

Inorganic chemistry

Vanadium

Phosphate

Positron annihilation

Physics

Organic chemistry

Annihilation

Doping

Positron

Analytical Chemistry (journal)

Chemistry

Electron

Impurity

Optoelectronics

Journal of Physics C Solid State Physics

Positron lifetime and annihilation photon angular correlation studies have been performed in glasses of molar composition xNa2O, (1-x)B2O3. A strong dependence of the lifetime parameters on composition, x, is attributed to underlying changes in both disorder and free volume. Additional investigations of the effect of vanadium doping in a sodium borate 0.2Na2O, 0.8B2O3 glass and a calcium phosphate 0.5CaO, 0.5P2O5 glass suggest a further positronium inhibition mechanism. An interpretation based on electron scavenging by the transition metal impurities is tentatively proposed.

Positron annihilation in sodium borate and calcium phosphate glasses